Try a bowl of porridge. Chuck a handful of raisins in as it's simmering and add a bit of honey. Nice and bulky and bugger all fat.
Another thing to try; when you get back, drink a pint ot two of water or water with Ribena or lemon barley water. The fluid will make you feel a bit full.
Basically, there's nowt wrong with stuffing your face after a long ride, but try to stuff it with healthier things. Have a look on the BBC food website, for example. I've tried to have a pot of chilli or something similar on the stove for when I get back, so I can put some rice on, go for a shower and have a nice big bowl of lovely nosh. Thai veg curry is nice (and pretty cheap too) – squash, sweet potato, low fat cocount milk, red peppers and red thai curry paste. Chuck a bit of chicken in as well and you've got something really tasty that's not too lardy.